terça-feira, 11 de fevereiro de 2014

Cherry

Prunus avium, sweet cherry, also called wild cherry

The Cherry is the fruit of many plants of the genus Prunus, and is a fleshy drupe (stone fruit). The cherry fruits of commerce are usually obtained from a limited number of species such as cultivars of the sweet cherry, Prunus avium. The name 'cherry' also refers to the cherry tree, and is sometimes applied to almonds and visually similar flowering trees in the genus Prunus, as in "ornamental cherry", "cherry blossom", etc. Wild Cherry may refer to any of the cherry species growing outside of cultivation, although Prunus avium is often referred to specifically by the name "wild cherry" in the British Isles.

Many cherries are members of the subgenus Cerasus, which is distinguished by having the flowers in small corymbs of several together (not singly, nor in racemes), and by having smooth fruit with only a weak groove or none along one side. The subgenus is native to the temperateregions of the Northern Hemisphere, with two species in America, three in Europe, and the remainder in Asia. Other cherry fruits are members of subgenus Padus. Cherry trees with low exposure to light tend to have a bigger leaf size so they can intercept all light possible. Cherry trees with high exposure to light tend to have thicker leaves to concentrate light and have a higher photosynthetic capacity.[1]

Most eating cherries are derived from either Prunus avium, the sweet cherry (also called the wild cherry), or from Prunus cerasus, the sour cherry.

The native range of the sweet cherry extends through most of Europe, western Asia and parts of northern Africa, and the fruit has been consumed throughout its range since prehistoric times. A cultivated cherry is recorded as having been brought to Rome by Lucius Licinius Lucullus from northeastern Anatolia, modern day Turkey, also known as the Pontus region, in 72 BC.[2]

The English word cherry, French cerise and Spanish cereza all come from the classical Greek (κέρασος) through the Latin cerasum, thus the ancient Roman place name Cerasus, today a city in northern Turkey Giresun from which the cherry was first exported to Europe.[6]

The cultivated forms are of the species sweet cherry (P. avium) to which most cherry cultivars belong, and the sour cherry (P. cerasus), which is used mainly for cooking. Both species originate in Europe and western Asia; they do not cross-pollinate. Some other species, although having edible fruit, are not grown extensively for consumption, except in northern regions where the two main species will not grow. Irrigation, spraying, labor, and their propensity to damage from rain and hail make cherries relatively expensive. Nonetheless, demand is high for the fruit. In commercial production, cherries are harvested by using a mechanized 'shaker'.[7] Hand picking is also widely used to harvest the fruit to avoid damage to both fruit and trees.

Cherries have a very short growing season and can grow in most temperate latitudes. The peak season for cherries is in the summer. In Australia and New Zealand they are usually at their peak in late December, in southern Europe in June, in North America in June, in south British Columbia (Canada) in July to mid-August and in the UK in mid-July. In many parts of North America, they are among the first tree fruits to ripen, while in Australia and New Zealand cherries are widely associated with Christmas.[8]

'Kordia' is an early variety which ripens during the beginning of December, 'Lapins peak' ripens near the end of December, and 'Sweethearts' finish slightly later in the Southern Hemisphere.

Like most temperate-latitude trees, cherry seeds require exposure to cold to germinate (a mechanism the tree evolved to prevent germination during the autumn, which would then result in the seedling being killed by winter temperatures). The pits are planted in the autumn (after first being chilled) and seedlings emerge in the spring. A cherry tree will take three to four years to produce its first crop of fruit, and seven years to attain full maturity. Because of the cold-weather requirement, none of the Prunus family can grow in tropical climates.

In Australia, cherries are grown in all the states except for the Northern Territory. The major producing regions are located in the temperate areas within New South Wales, Victoria, South Australia and Tasmania. Western Australia has limited production in the elevated parts in southwest of the state. Key production areas include Young, Orange and Bathurst in New South Wales, Wandin, the Goulburn and Murray valley areas in Victoria, theAdelaide Hills region in South Australia, and the Huon and Derwent Valleys in Tasmania.

Key commercial varieties in order of seasonality include 'Empress', 'Merchant', 'Supreme', 'Ron's seedling', 'Chelan', 'Ulster', 'Van', 'Bing', 'Stella', 'Nordwunder', 'Lapins', 'Simone', 'Regina', 'Kordia' and 'Sweetheart'. New varieties are being introduced, including the late season 'Staccato' and early season 'Sequoia'. The Australian Cherry Breeding program is developing a series of new varieties which are under testing evaluation.[37]

The New South Wales town of Young is called the "Cherry Capital of Australia" and hosts the National Cherry Festival.

Cherry anthocyanins, a class of phytochemical red pigments, were shown in preliminary research to possibly affect pain and inflammation mechanisms in rats.[40] Anthocyanins may have other effects which remain under basic research for their potential mechanisms. For example, according to one study, genetically obese rats given a diet of tart cherry powder mixed into a high-fat diet did not gain weight or body fat like those on a similar diet without the powder, and their blood levels of inflammationindicators were lower.[41]

The list below contains many Prunus species that bear the common name cherry, but they are not necessarily members of the subgenus Cerasus, or bear edible fruit. For a complete list of species, seePrunus. Some common names listed here have historically been used for more than one species, e.g. "rock cherry" is used as an alternative common name for both P. prostrata and P. mahaleb and "wild cherry" is used for several species.